Granted Patent
Utility
US 6,515,490 · App. 10/143,166
Conductive fluid-based position sensor and method
Inventor:
Eric L. Upton
Patented Case
View Patent ↗
Granted: Feb 4, 2003
Filed: May 10, 2002
Inventor
Eric L. Upton
Assignee (at issue)
Terabeam Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.